William a



(No Model.)

W. A. JAMES.

SKIM GATE FOR MoLDs.

ym MM Patented Nov. 14', 1893.

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l .QQ/meow# @Woe/M41 UNrrED STATES PATENT OFFICE.

WILLIAM A. JAMES, OF MILVAUKEE, WISCONSIN, ASSIGNOR OF ONE-FOURTH TO THE WILKIN MANUFACTURING COMPANY, OF SAMEA PLACE.

sKlM-GATE FoR Motos.

SPECIFICATION forming part of Letters Patent No. 508,884, dated November 14, 1893. Application iiled November 17, 1890 Serial No. 371,655-Vv (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM A. JAMES, of Milwaukee, in the county of Milwaukee, and inthe State of Wisconsin, have invented certain new and useful Improvements in Skim- Gates for Molds; and I do hereby declare that the following is afull, clear, and exactdescription thereo My invention relates to molds used in making castings of various kinds, and my invention consists in certain peculiar and novel features of construction and arrangement as hereinafter described and pointed out in the appended claims.

In order that my invention may be fully understood, I will proceed to describe it with reference to the accompanying drawings, in which-- Figure l is a sectional view of a mold with my improved skim-gate applied thereto. Fig. 2 is a transverse vertical section of the same on the line 2-2 of Fig. 1.

Previous to my presentinvention great difficulty has been experienced in making perfect castings on account of the entrance Aof slag or dross into the matrix of thel mold.

Although skimmers have been used in connection with the pouring ladles, they are not wholly eective in operation, even where the utmost care is taken, and consequently much slag or dross enters the mold and runs into the matrix and thus greatly lowers the quality of the casting.

It is the object of my invention to entirely exclude dross or slag from the matrix and thusproduce perfectly homogeneous castings. This result I accomplish by virtue of the construction and in the manner which I will now proceed to describe. Y

Referring to the drawings A designates the drag, and B the cope of a molders flask.

C designates the parting between the sand c in the drag and the sand c in the cope, and D designates the matrix of the mold, which imparts the required form to the casting.

E designates the cast-gate or ingate which extends downward through the sand in the cope and also partially into the sand in the drag and thelower extremity of which communicates with one end of a channel f with which my improved skim-gate F is provided.

The opposite endof this channel fcommunishown, is formed from clay or other suitable material, being shaped is a core box and baked in the ordinary manner. This skim gate is provided on Athe upper side of its bottom with transverse ribs f and above and alternately between the ribs f with other transverse ribs f2; openings f3 being thus left in the upper side of the gate intermediate of the ribs f2. Thus the channel is composed of a succession of inverted and upright U -shaped continuous sections; the tops of the inverted sections being open, and the bottoms of the alternate sections being closed. A number of recesses G, preferably of approximately conical shape are formed in the sand in the cope and register with the openings f3 in the top of the skim-gate F 5 the said recesses being formed by correspondingly shaped blocks (not shown) which are removed previous to the molding operation.

From the above description it will be seen that when the metal is poured into the castgate or ingate E, it will ilow down therein and enter the channel f of the skim-gate F. In flowing through this gate the ribs f f 2 thereof will cause the metal to llow alternately upward and downward and the slag or dross,

.being of less specic gravity than the metal, will collect within the recesses G and thus be retained by the latter. Y The pure metal will flow into the auxiliary gate or channel E and finally enter the matrix where itwill cool and solidify in the form of a perfectly homogeneous casting.

The above described form of skim gate is designed more particularly to be located at the point of separation between the drag and the cope of the flask, but when it is desired to make very heavy or deep castings, the skim gate may be made of greater thickness, and the upper ribs f2 extended to the top thereof so as to form chambers between said IOO ribs for the accumulation'oit` the dross and slag. The skim gate is located, in this instance, entirely below the jointbetween the drag and the cope, and a covering is placed over the upper openings to prevent the entrance of sand to the interior of said skim gate, the recesses G, being dispensed with by reason of the increased size of the upper openings in said skim gate, and the sand is firmly rammed into the drag uponA alllsides of the skim gate, the ingate being arranged to communicate with one end ot' the latter, and the other end of said skim gate being arranged in communication with the auxiliary ingate, as before described.

Vhle I have described my invention as applied to iask molds it is obvious that it is equally vapplicable to other forms of molds without impairing is efciency.

Having thus described my invention, what I claim vas new therein, and desire to secure by Letters Patent, is-

l. A skim gate for molders use comprising ahollow body of baked clay or analogous material provided with a longitudinal chan'nel'having openings at opposite ends of said body adjacent to the bottom thereof and with transverse ribs extending alternately from the upper and thelower surfaces of said longitudinal passage, and recesses located in the top of said body adapted to collect the dross and slag and prevent the same from passing into the matrix ofthe mold, substantially as described.

2. An improved skim gate for melders use, comprising a hollow body provided with alongitudinal zig zag channel extending through the same, and having openings at opposite ends of said body adjacent to the bottom thereof openings in the u top of said hollow body, and chambers 'or recesses located above said opening's,'an'd adapted to collect the dross and slag and prevent the passage of the same to the matrix of the mold, substantially as de- SCl'bed'.

In testimony that I claim the foregoing I have hereunto set my 'hfand 'at Milwaukee,in the county of Milwaukee and State 'of Wiscousin, in the presence of two witnesses.

WILLIAM A. JAMES.

Witnesses:

H. G. UNDERWOOD, RICHARD WI'RTH. 

